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Changes in Soil Phosphorus from Manure Application

USDA-ARS, New England Plant Soil and Water Laboratory, University of Maine, Orono, ME 04469-5753

View larger version (18K): [in a new window]   Fig. 1. Changes in (A) water-soluble P (WSP), (B) CaCl2–P, and (C) modified Morgan-P (MMP) over time after amendment with KH2PO4 or manure (beef, dairy, poultry, or swine) applied at 100 mg total P kg-1 soil. Data are corrected for extractable P in unamended soil, and data points are means of four observations; t is time (in days) after application of P sources.

View larger version (22K): [in a new window]   Fig. 2. Changes in (A) anion-exchange membrane extractable P (AEMP) and (B) Mehlich-3 P over time after amendment with fertilizer or manure (beef, dairy, poultry, or swine) applied at 100 mg total P kg-1 soil. Data are corrected for extractable P in unamended soil, and data points are means of four observations; t is time (in days) after application of P sources. Numbers provided at each sampling are least significant difference (LSD) at P = 0.05 level.

View larger version (17K): [in a new window]   Fig. 3. Phosphorus sorption-desorption characteristics of unamended Low, Medium, and High soil-P level pretreatments, equilibrated for 24 h in 0.01 M CaCl2.

View larger version (23K): [in a new window]   Fig. 4. Effect of P application rate, P source, and background soil P level on CaCal2–extractable P.

View larger version (15K): [in a new window]   Fig. 5. Relationship between degree of soil saturation with P from Mehlich-III extraction (DSSPM3) and CaCl2–P, using combined data from two incubation experiments.